Improvement in hoisting-machines



UNITED STATES PATENT-OFFICE.

JAMES MCOALVEY, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN HOISTING-IVIACHINES.

Specification forming part of Letters Patent No. 57,535, dated August 28, 1866.

T o all whom it may concerto:

Be it known that I, JAMES MGUALVEY, of the city and county of Philadelphia, and State of Pennsylvania, have invented a new and useful Improvement in Safety-Stops of Hoisting- Machines; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

The nature of my invention and improvement consists in a combina-tion of gripe-levers with vertical ratchets and the lifting rope or chain of a hoisting-machine by means of a vertical yoke and trip-levers, in such a manner that when the rope or chain breaks the gripelevers are thrown into connection with said ratchets, and thus arrest the downward movement of the cage to prevent further casualty.

To enable others skilled in the art to which my improvement appertains to makeand use my invention, I will proceed to describe its vcon struction and operation.

In the accompanying drawings, Figure l is a top view or plan of the machine. Fig. 2 is a front elevation of the same. Fig. 3 is a vertical section at the red line l 2 of Fig. 2v. Fig. 4 is a perspective view of one of the trip-levers H. Figs. 5 and 6 are an edge and end views of one of the gripe-levers I. Figs. 7 and 8 are an edge and end views of one ot' the castings J. Figs. 9 and l() are aface and edge views of one of the wedge-keys L. y

Like letters in all the igures indicate the same parts.

A is the cage or platform. B B are the uprights, and C a cross-beam framed to their Lipper ends. D D are stout timbers, which eX- tend through all the stories of the range'ot' the cage A. On the inner sides of said timbers the ratchets E E are fastened by means of screws. The ratchets have teeth on'each edge to receive the teeth of gripe-levers, as I will presently describe.

F is a lifting-yoke, fitting loosely on the beam C, between guiding-irons. Thelower end of the windlass-rope Gis attached to the crossrod a of the yoke. rIhere are pairs of trip-levers H H and I-I H connected to the beam C by means or the fulcrum-pins b. The inner ends ofthe levers have slots e, which connect with the pins b', the pins being screwed into the sides of the beam. On the outer ends ot' said levers there are inclines d, which bear against the inclines e on the inner ends ofthe gripe-levers I I I l, which partially turn on the screw-bolts ff, that pass through the cheeks ot' the castings J, the longitudinal grooves of which receive said levers. These castings are secured to the sides of the beam C by means of screws, as represented in the drawings. The said gripe-levers have double catches or teeth g g, which tit in corresponding teeth of the ratchets E E. There are springs K K K K, with their permanent ends secured to the Sides ofthe beam C by means of screws. Their resilient ends bear.`against levers I I I I, and keep their inclines' c against the inclines (l of the trip-levers when in the position represented in the drawings. One ot' the trip-levers is shown detached in Fig. 4, one of the gripe-levers in Figs. 5 and 6, and one of the castings J in Figs. 9 and l0.

There are double wedge-keys L, which fit in vertical slots h of the castings J, which have inclines t' on their inner edge, that t against corresponding inclines j on the outer ends of the trip-levers I. Then these levers are to be thrown into connection with the ratchets E, the keys L are borne down by t-hc springs M M, whose permanent ends are fastened by means oi' screws to the upper side of the beam C 5 but when the gripe-levers are disenga ged from the ratchets the shoulders k rest on the top edges of the levers. When the levers are to be thrown into connection with the ratchets, as their outer ends are thrown inward they are disengaged from said shoulders, which allows the springs M M to exert their force in causing a sudden descent to the keys L, which, by means oi' their inclines i, instantaneously throw the levers into connection with the ratchets. l

N N N N are slides on the outer sides of the uprights D D, whose cheeks lhave an easy fit against the edges of the ratchets E E. The

slides are secured to the uprights by means of screws.

O is a spring between the lower end of the yoke F and the cross-beam C, for the purpose ot' giving a sudden descent to the former to throw the trip-levers out of connection with the gripe-levers when the rope or chain breaks.

The operation is as follows: The machine is in Working order, as represented in the-drawscribed, acting against the inclines j of the 1e- Vers, assist in connecting them with the ratchets, and thus an instantaneous stop of the cage is produced.

The teeth of the Ylevers land ratchets are made alittle hooking, to assist in effecting instantaneous action.

Having thus fully described my improvement in safety-stops of hoisting-machines, what I claim therein as new, and desire tosecure by Letters Patent, is-

1. The combination of the gripe-levers I,

springs la, keys L, and springs arranged and operating in relation to each other and to the permanent ratchets E substantially in the manner hereinbefore described, and for the purpose set forth.

2. The combination-fof the trip-levers H with the yoke F, beam C, and gripe-'levers I, substantially as described, and for the purpose specified'. D

3. The combination of' the spring O With the beam C and yoke F, for giving an instantaneous drop to the-latter when the rope or chain breaks, and thus throwing vthe gripe-lever I instantly into connection with the permanent ratchets E, to securely lock the cage A, substantially as described.

In testimony that the above is iny-invention I` have hereunto set my hand and afxed my seal this 19th day of'June, 1866.

JAMES MGGALVEY. [L s]V Witnesses:

STEPHEN UslIcK, JOHN WHITE. 

